PlayStation 1 SCPH-900x Modchip Problem

Hi. I got a modchip for a PlayStation 1, and I do not know what it was meant for. I mean, is it a Onechip, MM3, etc...

Turns out, the seller game me some printed diagrams on paper, and they match the MM3 PSX Diagrams.

However, the problem is, it DOES boot copied games, but it will NOT boot the originals. Looking at you Jiin

Any ideas?


*EDIT*
I have tried the V2 MM3 diagrams, and it still does not boot original disks.

 

The MM3 is not universal, only MM1.4 and lower are. You need to find out what code was used SCEE,SCEI,SCEA since it will only work for that region system.

 

It will play all copied games, but not originals.

A SCEE original will not boot.
NTSC-J, NTSC-U/C and PAL copied games work fine.


You're saying, the modchip will only play either an SCEI original, or SCEA?

 

Sorry I was using my mobile to reply and misread the post.

The problem you are having is very common with the original OLD CROW hex, if it was a MM3 you shouldn't have that problem

here are the install diagrams for it
900X

 

Nope. My diagram did not look like that at all.

 

He knows what the MM3 install looks like. He is saying the problem you are having is common if your chip has the old crow hex on it. Considering you have no idea what you bought, then you cant really say he is wrong.


Why dont you just try reading the chip, then you can see what code it is programmed with?

Or better yet, just get the right one to start with and know whats on it.

 

IIRC Old Crow hex won't do stealth. MM3 should on a 900x if memory serves.

 

I never said Jiin was wrong.
I am just trying to figure out what is the correct pins for this chip.

It works with the pin diagram I posted. I guess I can try Jiins diagram he posted and see what happens.


Sure. I can dump the HEX and check it out, or yes. Just make my own so I know what is on it.


I have some 12F508 I/P chips left over.
What can I use on these. MM3, Onechip or Old Crow?

 

Your reply to his post was "Nope" when he told you a possible cause of your problem. So yes, you did say he was wrong.

MM3 for that console.

 

Oh I guess you're right. Sorry.

I said my diagrams dont look like that, because I got two sheets of paper from the seller.
One did not match the MM3 (not the V2) image of the 900x, and the other also matched the 550x of the MM3.

So Jiin is saying that it has the Old Crow code on it.

Let me scan them and upload them so you can have a look...

 

Jinn said your symptoms happen with chips with the old crow hex on it. Without actually knowing whats on the chip, thats your best guess/answer so far.

You should be able to read the chip (I dont think anyone read protects them anymore, as the code is freely available). View the buffer and you will see MM3, onechip, etc in the header

 

That isnt for your model PS1. Upload the one for your model

 

Yeah you're right. I will do this and let you know.

 

Thats what I am saying. This is the sheet he gave me. It is for a 750x.
I would like to use it on a 900x.

I have been trying to match it with the MM3, MM3 v2, One Chip or Old Crow.

I have a another sheet he gave me for a 550x also, and it matches the MM3.

So I dunno. I think the guy did not know what he was doing and got them all mixed up.


I will just read the code on the chip and see what it is.

 

Well, that picture doesnt look like the MM3 installation on 7502 - so I guess your chip isnt MM3.

Just try and read the chip or just make a MM3 chip and be done with it. Why didnt you just make your own in the first place anyway?

 

Yeah I will read it and check it out

I didn't know if the chips I had (12F508 I/P) would work with the MM3 code.

 

The F versions SHOULD work... but I had trouble with a chip on one console....

Turned out to be a fault with that console too, but I never retested the F chip. Heard reports of them working and reports they dont.

I should retest really, as the F versions are cheaper and rewritable.

 

I remember we had a topic going about it I think: http://www.assemblergames.com/forums/showthread.php?33998-What-Modchip-for-a-SCPH-102-(PSone)

I will give the 12F508 a go tonight and see if I can get it to work on a 5502.


I find the problem or error I get is because I flash it incorrectly.
I will take a look tonight and see what my Willem programmer has, because I cant remember...

 

Okay, I tried to program it and I am having some issues with mu programmer (the Willem Universal).

There is no PIC 12F508. Only a PIC 12F629.
I selected it anyhow because it should be the same.

Here is the datasheet: http://uk.farnell.com/microchip/pic12f508-i-p/ic-8bit-flash-mcu-12f508-dip8/dp/1123006
I think I need this: http://uk.farnell.com/microchip/ac163022/programmer-adapter-pic12f-2x3-dfn/dp/1971903

I paid $30 for the programmer itself. What a waste of money imo.


Anyway, if I pick the 629 device, is it okay?